<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<style>
    .active{
        width: 100px;
        height: 200px;
        background: pink;
    }
</style>
<body>
   <div id="app"></div> 
   <script type="text/babel">
    /* 
      jsx语法1:
        - 虚拟DOM中要混入js表达式，要用{},{}中只能写变量或者表达式,不能书写语句(表达式有返回值,语句没有返回值)
    */
   const isActive = true
   const title = '哈哈哈'
   const vDom = 
   (<div>
        <h1>
        {title}
        </h1>
        <p className ={isActive?'active':''}>哈哈哈哈</p>
    
    </div>)

    ReactDOM.createRoot(document.getElementById('app')).render(vDom)

   </script>
</body>
</html>